Undefeated boxing champion Floyd Mayweather has confirmed he will apply for a licence to fight Mixed Martial Arts, ramping up speculation the retired boxer will fight former UFC champion Conor McGregor.

John Zielke out to quinella juvenile races

John Zielke is confident he can maintain his rating as Queensland's leading trainer of young horses by providing the quinella in the first two metropolitan juvenile races of the season on Saturday.

Zielke has always had a good two-year-old since first coming to Brisbane in 1994 and winning the Listed Meynink Stakes at Eagle Farm with Our Civic Hope.

He has since won more than 100 two-year-old races and holds the Queensland record for the most juvenile race wins in a season.

Zielke showed he was well on course for another big season when his colt Hopes Eternal ran a class record in winning the first Queensland two-year-old race of the season in the Pat O'Shea Plate at Toowoomba on Sunday.

He has a strong hand in both divisions of the first metropolitan two-year-olds with Rains Aplenty and You Know The One in the colts and geldings division and Miracles Aplenty and Rosa's Charm in the fillies at the Gold Coast .

Zielke never lacks confidence but he has every reason to believe he can quinella both races.

"They have all trialled well and I find it hard to split them. Rains Aplenty ran good time in winning his trial and he will probably be up near the lead," Zielke said.